Incandescent-lamp socket.



HUBBELL.

Patented Aug. 18, 1914.

WITNESSES.

the other.

" nanvnvliionenm, or BRIDGEPO-RT, connncrrcor.

INCANIDESCENT-LAMP SOCKET.

rte-7.951.

Specification of Letters Patent.

Patented Aug. 1 3,1914.

Application filed may 31, 1912. Serial No. 700,627.

T all whom it may comm:

Be it knownithat I, HARVEY HUBBELL, a citizeng 'of the. United States,residing at Bridgeport, county of Fairfield, State of Connecticut, haveinvented an lmprovement 1n Incandescent-lamp Sockets, of which the andunlocking by inward pressure upon one member and a slight reversemovement. In. the accompanying drawing forming a partiofthi'sspecification, Figure 1 is an ole-- vation of a lamp socketpartly broken away to show the engagement of the members; Fig. 2 a. planview .of the shell detached; Fig. 3 a section on thewline 3-3 inFig. 1,looking in the-direction of the arrows; Fig. 4 an elevation, partlyinsection, of the cap detached, showing a variant form of constru'ctionFig. 5 a greatly enlarged sectional view of the shell detached on thesame section line as that of. Fig. 3; Fig. 6 a view corresponding withFig. '1, illustrating a variant form of construction; and Fig; 7 is adetail sectional view onthe line indicated by 7, in Fig. 6, looking inthe direction ofthe arrows. j p

The two members comprise a shell 10 and a cap 11, said members beingprovided with a circular series of cooperating engaging elements whichare caused to engage by rotary movement of one member relatively to Theedge of the shell is provided with a series of depressions 12 be tweenwhich are ribs 13 which are left to correspond in contour with the bodyof the shell. The engaging elements on the shell are transverse'groovesor slots 15 in the ribs. In Figs. 1 and 5 I have shown these ele mentsas slots and in Figs. 6 and 7 as grooves. At the base of each depressionis a shoulder 22 and extending vertically through one of the depressionsand down into-the body of theshell is a slot 14 whlch gives resilienceto the shell, for a purpose that will presently be apparent.

The essential feature of the cap is a series of'inwardly extendingprojections 18 which correspond in number with the transverse slots, andare adapted to be turned into engagement with said slots. s formed fromrelatively light metal, proections 18 may be formed upon a ring 19 ofheavier metal which is retained in place by closing themetal atthe-lower edge of the cap about it, as at 20 inFig. 1. Where the cap isformed from relatively heavy metal, the projections may be formedintegral with the cap, as clearly shown in Fig. 4. It will be noted thatthemembers when engaged are held against longitudinal displacement by aseries of bayonet joints eX tending entirely around the members, so thatit is made practically impossible to'detach the memberslongitudinally.Suitable stops may be provided tor-limit the forward rotation of the capwhen the projections have passed into the transverse slots, and alsomeans for locking the cap against backward movement. In the presentinstance I have shown the left ends of the transverse slots as closed byintegral stop walls 16,

which are adapted to be engaged by the projections. It isimmaterial-wliether all or a part only of the transverse slots areprovided with means for stopping the forward rotation of the cap.

As a lock against backward movementI provide the right end of thetransverse slot in the next rib to the left of vertical slot 14:, saidtransverse slot being specifically, indicated by 15, with a suitablelocking -means 17, shown in the present instance as an inclined lockingwall, see Fig. 5, which shows the shell in section on the same line asin Fig. 3.

The form illustrated in Figs. 6 and 7 differs from the form in Figs. 1and 5 in that a downwardly extending flange 21 is formed at the lowerend of the cap, and the engaging element shown is a groove in lieu of aslot.

The operation is as follows: The shell and cap are placed together inany relative position with the projections engaging the shoulders at thebases of the depressions, any projection passing freely into any of thedepressions. In this position of the parts, forward rotation of the caprelatively to the shell will cause the projections to pass into thetransverse slots, the rotary movement being stopped by the engagementof-the pro-. .jections with the stops at the left ends of the slots.

Reverse movement of the cap is When the shell prevented by theengagen'ient of one of the projections with the locking means at theright end of the transverse slot specifically indicated by if), so thatthe parts are'now locked together and against movement in any directionrelatively to each. other. This locking of the parts may be overcome bypressing inward upon the shell close to ver tical slot l l on the leftside, sufficiently to depress the locking means below the contiguousprojection, or far enough so that the projection will ride up over thelocking means and spring it out oi the Way. It will be noted, (see Big.5) that the outer face or the locking means is an incline, so that inthe locking movement, the contiguous projection, will ride up the outerface of the locking means and spring it downward until the projectionhas passed, when the looking means will spring up back of the projectionand lock the members against the possibility of reverse movement untilthe shell is pressed inward as already described.

Having thus described .my invention I claim:

1. An incandescent lamp socket comprising a shell provided withalternate depressions and ribs, one of said depressions hav ing avertical slot through it and said ribs having transverse slots withstops at one end, and the transverse slot on one side of the verticalslot having a locking stop at the opposite end, and a cap havinginwardly extending projections adapted to pass into the depressions andto be turned into the transverse slots.

2; An incandescent lamp socket comprising a shell having a series ofequal alternate longitudinal depressions and ribs, one of saiddepressionshaving a vertical. slot through it and a cap having proections cormower responding with the depressions on the shell, andadapted to enter therein, the ribs on the shell being provided withtransverse slots adapted to receive the projections upon rotation of thecap, each of said slots having a stop at one end to prevent rotation inthat direction and one of said slots having a locking stop at the otherend'thereof to prevent rotation in the opposite direction, said lockingstop'being adapted to release the projection when the shell is pressedinward contiguous to the vertical slot. 4

3. An incandescent lamp socket comprising a shell provided withalternate depressions and ribs, one of said depressionshaving a verticalslotthrough it and said ribs having transverse slots with stops at theirleft ends, and the tr ,nsverse slot at the left of the vertical sl thaving a locking stop at its right end, I and a cap having inwardlyextending projections adapted to pass into the depressions and to beturned into the transverse slots; 7

el. An incandescent lamp socket comprising a shell provided withalternate depressions and ribs, said depressions terminating inshoulders and said ribs being provided with transverse slots havingstops at their left ends, and one of said 'slots having a locking stopat its right end, and a cap having inwardly extending projections whichenter the depressions and engage the shoulders and are then turned intothe'transverse slots.

In testimony whereof I affix my signature in presence of two witnesses.

HARVEY HUBBELL.

Witnesses: p l A. M. l/VoosTER,

S, W. A'rHnRrroN,

